diff --git a/docs_src/Gemfile.lock b/docs_src/Gemfile.lock
index f4776e9..acef9e2 100644
--- a/docs_src/Gemfile.lock
+++ b/docs_src/Gemfile.lock
@@ -4,8 +4,8 @@ GEM
     activesupport (3.2.22.5)
       i18n (~> 0.6, >= 0.6.4)
       multi_json (~> 1.0)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     bibtex-ruby (4.4.7)
       latex-decode (~> 0.0)
     citeproc (1.0.10)